<pre>PHP Notice &#039;yii\base\ErrorException&#039; with message &#039;Undefined offset: 1&#039;

in /home/journalb/public_html/journalb/controllers/SiteController.php:427

Stack trace:
#0 /home/journalb/public_html/journalb/controllers/SiteController.php(427): yii\base\ErrorHandler-&gt;handleError(8, &#039;Undefined offse...&#039;, &#039;/home/journalb/...&#039;, 427, Array)
#1 [internal function]: app\controllers\SiteController-&gt;actionNewsletterdo()
#2 /home/journalb/public_html/journalb/vendor/yiisoft/yii2/base/InlineAction.php(55): call_user_func_array(Array, Array)
#3 /home/journalb/public_html/journalb/vendor/yiisoft/yii2/base/Controller.php(151): yii\base\InlineAction-&gt;runWithParams(Array)
#4 /home/journalb/public_html/journalb/vendor/yiisoft/yii2/base/Module.php(455): yii\base\Controller-&gt;runAction(&#039;newsletterdo&#039;, Array)
#5 /home/journalb/public_html/journalb/vendor/yiisoft/yii2/web/Application.php(83): yii\base\Module-&gt;runAction(&#039;site/newsletter...&#039;, Array)
#6 /home/journalb/public_html/journalb/vendor/yiisoft/yii2/base/Application.php(375): yii\web\Application-&gt;handleRequest(Object(yii\web\Request))
#7 /home/journalb/public_html/journalb/web/index.php(12): yii\base\Application-&gt;run()
#8 {main}</pre>